No. The only way the Russians could prevail is to break out the nukes, and that would always run the risk of a nuclear response from the US. Japan's navy is more powerful than the Russian pacific fleet in a conventional conflict. Any attempt to land on Hokkaido would be stillborn.

Even if they managed to land they would probably be pushed off pretty quickly. Japan's military is more powerful than that of Ukraine, and the Russians are already having trouble supporting troops just across the border. There's no way they would be able to support an invasion force over water. I'm skeptical the Russians could pull that off without opposition, something they would certainly have in spades.